*{
    padding: 0;
    margin: 0;
}
#container{
    display: flex;
    width: 800px;
    flex-direction: column;
    margin: 0 auto;
}
#header,#footer{
    width: 800px;
    height: 30px;
    background-color: red;
}
#mid{
    width: 800px;
    height: 800px;
    display: flex;
    background-color: aqua;
}
#mid .box1{
    width: 200px;
    background-color: aqua;
    display: flex;
}
#mid .box2{
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    background-color: blue;
}
#mid1,#mid2,#mid3{
    width: 90%;
    height: 200px;
    background-color: blue;
    display: flex;
    margin: 0 auto;
    justify-content: space-between;
}
#mid1>div,#mid2>div,#mid3>div{
    width: 30%;
    background-color: green;
    height: 60%;
}
#mid .box3{
    width: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-around;
}
#mid .box3 div{
    width: 70px;
    height: 80px;
    background-color: black;
}





/* div:first-child{
    width: 6em;
    height: 30px;
    background-color: aqua;
    border-radius: 5px;
    text-align: center;
    margin: 100px 0px 0px 100px;
    color: white;
    position: relative;
}

div:first-child:before{
    content: '';
    width: 0px;
    height: 0px;
    border: 10px solid transparent;
    border-bottom-color:aqua;
    display: block;
    position: absolute;
    left: 37px;
    top: -17px;
}

div:nth-child(2){
    position: relative;
}
div:nth-child(2):hover::after{
    content: '';
    width: 4px;
    height: 2px;
    border-bottom-color:rgb(255, 0, 242);
    
    position: absolute;

    left: 24px;
    top: 0px;
} */